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Pin and chain

a technology of bendable chains and pins, which is applied in the direction of driving chains, shafts and bearings, mechanical equipment, etc., can solve the problems of silent chain stretching as the abrasion, reducing the durability of the assembly, and increasing the number of assembling processes, so as to increase the hardness and oil retention

Inactive Publication Date: 2009-08-04
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration ensures consistent lubrication across sliding surfaces, reducing wear and tear, thereby enhancing the silent chain's durability and maintaining performance without increasing assembly complexity or costs.

Problems solved by technology

As such, an insufficient lubrication effect on the sliding portions may result which reduces the durability of the assembly.
Particularly, abrasion is easily generated in a portion of the outer circumferential surface of the pin which is brought into strong contact with the inner surface of the pin hole due to a tensile force of the silent chain, leading to a problem that the silent chain stretches as the abrasion continues.
In order to solve this problem, it is conceivable that the phase of the helical groove of the pin can be aligned with the link plate, but such an arrangement results in a problem wherein the number of assembling processes increases as do the costs associated with manufacturing the silent chain.

Method used

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Experimental program
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Effect test

first embodiment

[0045]Since the two guide plates 12, constituting the guide row, and the two pins 13 are integrated by press-fitting and crimping, the two inner link plates 11i supported by the two pins 13 are not relatively rotated with respect to the two pins 13, and the lubrication condition of the sliding portions becomes relatively gentle. In contrast, since the two outer link plates 11o constituting the link row are relatively rotated with respect to the two pins 13, the lubrication condition of the sliding portions becomes relatively severe. However, in the first embodiment, even in the outer link plate 11o under the severe lubrication condition, at least one (e.g., two) helical groove 13b opposes the arbitrary generatrix on the inner circumferential surface of the pin hole 11a which preserves an oil coating layer thereon.

[0046]In the above-mentioned first embodiment, the pitch P of the helical grooves 13b is set equal to the width Bi in the axial direction of the pin hole 11a of the inner l...

second embodiment

[0050]Next, the present invention will be described with reference to FIG. 5.

[0051]When the silent chain Cs is wound around the sprocket, the adjacent link plates 11o, 11i are relatively rotated by an angle θ calculated from 2π / (number of teeth of the sprocket). The smaller the diameter of the sprocket around which the silent chain Cs is wound (the smaller the number of teeth), the larger the angle θ. Thus, the angle θ is determined based on the sprocket whose diameter is smallest among the plurality of sprockets around which the silent chain Cs is wound.

[0052]As mentioned above, the inner link plate 11i is not relatively rotated with respect to the pin 13. Further, only the outer link plate 11o is relatively rotated with respect to the pin 13. Thus, the relative rotation angle between the pin 13 and the outer link plate 11o becomes θ. With the relative rotation angle θ, the outer circumferential surface 13a of the pin 13 is brought into sliding contact with the inner circumferentia...

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Abstract

A pin is relatively rotatably fitted into a pin hole formed in an outer link plate of a chain. A plurality of helical grooves are formed on an outer circumferential surface of the pin. A pitch P between adjacent helical grooves in the axial direction is equal to or less than a width in the axial direction of the pin hole of the outer link plate. At least one helical groove is arranged to oppose an arbitrary generatrix on an inner circumferential surface of the pin hole. Also, when a radius of the pin is R and a relative rotation angle with the mating member is θ, a pitch P′ in the circumferential direction between adjacent helical grooves is Rθ or less. Thus, at least one helical groove is arranged to always pass each position in a sliding range between the pin and the pin hole.

Description

RELATED APPLICATION DATA[0001]The present invention is based upon Japanese priority application No. 2006-13517, which is hereby incorporated in its entirety herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a pin and a bendable chain. The pin is rotatably supported by a pin hole of a mating member and has a cylindrical outer circumferential surface about an axis with at least one helical groove formed therein. The bendable chain has link plates connected to each other by a plurality of the pins.[0004]2. Description of the Related Art Japanese Patent Application Laid-Open No. 3-153942 discloses a conventional silent chain wound around sprockets to transmit a driving force, wherein a helical groove is formed on an outer circumferential surface of a pin connecting a link plate and a guide plate. To lubricate the silent chain, oil is supplied through the groove to sliding portions of an inner circumferential surface of a...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B21L9/02F16G13/06
CPCF16G13/02F16G13/06F16G13/04
Inventor FUJIWARA, AKIRAKAWAMURA, MORINOBU
Owner HONDA MOTOR CO LTD